Lock



Jam 20, 1931. JACOB] 1,789,756

Filed Dec. 23, 1925 2 Sheets-Sheet l Z2 I? 3 w 27 INVENTOR 60% I 'W -MATTORNEY Patented Jan. 20. mm

UNlTED s'ra'ras PATENT oFFica EDWARD N. IACOIBI, OF MILWAUKEE,WISCONSIN, ASSIG-NOR- TO- BRIGGS 1&2 STRATTON v CORPORATION, OFMILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE LOCK Application fliedDecember 23, 1925. Serial No. 77,294.

This invention has for its object to provide a" lock having its wearingsurfaces sheathed with hard metal so as to increase the life anddurability.

Another object of the invention is to provide a lock with a die castlock barrel whereby uniformity is obtained at low cost of manufacture,the cam or wrist-pin thereof being provided with a hard metal sleeve orcap to take the wear.

Another object of this invention is to provide a lock with a swingingcover to protect it from dust and toconstitute a guide for assisting inplacing the key in the lock.

Another object of-the invention is to improve upon details ofconstruction of locks of this character.

With the above and other objects in view the invention consists in thelock as herein 2o claimed, its parts and combinations of parts and allequivalents.

Referring to the accompanying drawings in which like characters ofreference indicate similar parts indifferent views.

Fig. 1 is a central longitudinal sectional view of one form of lockconstructed in accordance with this invention;

Fig. 2 is a transverse sectional view thereof on the plane of line 2-2of Fig. 1;

Fig. 3 is a plan view thereof with the cover closed;

Fig. 4 is a similar view with the cover opened by the key which isguided into the key slot thereby; I

Fig. 5 is a longitudinal section on a plane at right anglesto the planeof Fig. 1;

Fi 6 is a central sectional view of a modi cation of the lock;

Fig. 7 is-a transverse sectional view thereof on the plane of line 77 ofFig. 6;

Fig. 8 is a lon itudinal sectional view of another modificatlon of thelock;

Fig. 9 is a transverse sectional. View thereof on the plane of line 99of Fig. 8;

Fig. 10 is a detail sectional view thereof on a plane at right angles tothe plane of Fig. 8; v

ig. 11 is a detail view of the lock bolt; Fi 12 is a sectional elevationof another modi cation;

' Fig. 13 is a similar view taken at right angles to that of Fig. 12withthe lock bolt sectioned, and

Fig. 14; is a bottom view thereof.

In these drawings, 15 indicates a lock-case and 16 is the lock barrelmounted to rotate or oscillate therein and provided with tumblersl't' toengage in opposite recesses 18 of the lock-case to prevent the lockbarrel from turning when the key 19 is removed but adapted to bewithdrawn flush with the surface of the lock barrel by the differentsized bits of the key so that the lock barrel may he turned by the keywhen the key is in position.

In the form of lock shown in Figs 1 to 5 inclusive the lock-case 15forms the head of a vertically moving lock-bar 20, which, when depressedagainst a spring 21, performs a locking engagement as with the gearshift rods of a gear shift mechanism for automobiles and the like, thelocking bolt 22 projecting from the side of the lock-case to engage arecess in the guide or housing 23 to hold the lock-bar in its depressedlockin position.

The lock barrel is preferably die cast for uniformity and inexpensivecost ofmanufacture and is formed with a cam or wrist-pin projection 24on its lower end engaging in a groove 25 of the locking bolt, wherebythe turning of the lock barrel by means of the key 19 causes thewithdrawal of the locking bolt 22 against the pressure of its coiledspring 26. A flat surface on the top of the locking bolt engaging theend of the lock barrel prevents the locking bolt from turning.

It is an object to make thiswrist-pin or cam 24: as large as possible soas to obtain the requisite strength and consequently it includes aportion of the key slot and. as the metal of which the die cast lockbarrel is made is unsuitable for withstanding wear, particularly whenreduced to sharp corners as in this manner, a hard metal sheathing 2?surrounds the cam or wrist-pin to form the bearing surface thereofengaging the locking bolt. As shown in Figs. 1 and 2, this sheathing maybe in the form of a flanged ring having a. driven fit on the cam orwrist-pin and preferably indented where it crosses the key slot toprevent it from working loose. The hard metal sheathing protecting thealloy die casting at the part subjected to greatest. wear materiallyprolongs the life of the lock.

Although the lock barrel has a working fit in the-lock-case forpractically its full length except where the lock-case is grooved toprovide the tumbler recesses 18, it is given an additional protectedbearing by having a harder metal cap 28 fixed on its upper end androtatably mounted in the stepped bore of the lock-case. The cap 28covers the end of the lock barrel and contains the key-hole registeringwith the key slot through the lock barrel and is held in place againstremoval and to take the end thrust of the lockbarrel by having a groove29 surrounding it, through which is passed a tangent pin 30.

A dust cover 31 is pivotally mounted on a pin 32, which is secured tothe lock-case by fitting in a longitudinal opening in the wall thereofand by having the wall of said opening swaged or indented into a recessof the pin, as shown at 33. The cover is of such shape as to conform tothe outline of the lockcase except that at one edge it is provided witha straight portion-against which the flat key may fit for swinging thecover to its open position, and a projecting shoulder 34 at the end ofsaid straight portion against which the edge of the key bears so that asthe key swings the cover it is guided thereby to the keyhole, as shownin Fig. 4. The

cover is closed by a spring and its closed position is determined by theengagement of its side flange with a stop pin 35, the spring beingformed of a wire coiled about the pin 32 with one end anchored in anopening 36 in the end of the lock-case and the other end engaging theflange of the straight edge of the cover and held against displacementby a lug 37 bent up from said flange.

In operation the key is used as a means for swinging the dust cover andis guided thereby to the key opening and its insertion in the lockbarre]. causes the withdrawal of the tumblers as usual so that thetumbler With'its cap 28 may be turned by means of the key to withdrawthe locking bolt 22, permitting the lock-case to spring upwardly andwithdraw the lock-bar 20 from its locking engagement with the gear shiftrods or other parts controlled thereby. This upward movement of thelock-case is preferably limited by a set-screw 38 in the housing 23projecting into a vertical slot 39 in the wall of the lock-case. hen itis desired to again lock the mechanism it is only necessary to press thelock-ease downwardly against its spring by means of the key and thenturn the key and remove it, the locking bolt 22 returning to its lockingengagement as the result of the turning movement of the lock weavesbarrel and the dust cover returning to its closed positionautomatically.

In the modifications shown in Fi s. 6 and 7, and in Figs' 8 to 10inclusive, t e wristpin 24' engages a groove 25' in the side of thelocking bolt 22 instead of in a transverse slot across the top of thebolt as before and this engagement prevents the locking bolt fromturning. The hard meta-l sheathing for the wrist-pin or cam in thisconstruction is preferably in the form of a cup 27 bent up from a sheetmetal disk, as shown.

In. thatmodification shown in Figs. 12, 13 and 14, the lock-case 15'does not move and is held from movement by the engagement of a screw,not shown, in an opening 40 in the side thereof, and the cam orwrist-pin 24 is of an oval shape with a hard metal sheathin in the formof an oval shaped band 27" fitting thereon and held in place by stakingwith a prick punch at various points, as shown at 41. The locking bolt22 of this construction is not carried by the lock-case, but forms apart of the mechanism with which the lock is associated and the groove25" in the top thereof engaged by the cam or wrist-pin24" -is ofsufiicient length to receive the cam or wrist-pin when the latter isturned to a position in alignment with the locking bolt, the twopositions of the locking bolt being determined by the turning of the camor wrist-pin therein through an angle of 90.

Although the lock is described as pertaining to a gear shift mechanismfor automobiles, it is to be understood that it is not limited to anyparticular purpose but is capable of general use.

What I claim as new and desire to secure by Letters Patent is:

1. In a look, a lock-case, a lock barrel fitting therein and providedwith an integral projection on its end forming a cam, a locking bolthaving a slot receiving the cam, and a hard metal sheathing surroundingthe cam and fixed thereto.

2. In a lock, a lock-case, a lock barrel fitting therein comprising adie casting with an integralprojection forming a cam at its end, a hardsheet metal flanged band surrounding the cam, and a locking bolt havinga groove receiving the cam and engaged by the flange.

3. In a lock, 2. lock-case, a lock barrel fitting therein having anintegral projection forming a cam on its end, there being a key slotthrough the lock barrel and the cam, a hard metal covering for the camprojecting into the key slot, and a locking bolt having a slot receivingthe cam. V

4. In a lock, a lock-case, a lock barrel fitting therein and providedwith an integral projection forming a cam onits end, a hard sheet metalflanged sheathing surrounding the ram. and a locking boltfitting in thelockcase having a transverse slot receiving the sheathed earn andengaged by the flange.

5. In a look, a lock-case, a lock barrel fitting therein and providedwith an integral projection on its end forming a cam, a hard sheet metalsheathing surrounding the cam, a locking bolt fitting in the lock-caseand having a recess to receive the cam, there being a flat surface onthe locking boltbearing against the end of the lock'barrel to preventthe locking bolt from turnin 6. In a lock, a 100 -case, a lock barrelfitting therein and provided with an inte ral projection forming a camon its end, t ere being a key slot through the lock barrel and the cam,a hard sheet metal sheathing surrounding the cam indented to form aprojection entering the key slotof the cam, and a locking bolt having aslot to receive the sheathed cam.

7. In a lock, a lock-case, a lock barrel fitting therein and providedwith an integral pro ecti0n forming a cam on its end, there being a keyslot through the lock barrel and the cam, a flanged ring having a drivenfit on the cam and indented Where it crosses the key slot, and a lockingbolt having a slot receiving the cam.

8. In a look, a housing, a lock-case slidably mounted therein, a springbearing on the lockcase for sliding it, a lock-bar carried by thelock-case, a die cast lock barrel fitting in the lock-case having anintegral projection forming a cam on its end, a hard sheet metal flangedband surrounding the cam, and a spring-pressed locking bolt slidablymounted in the lock-case and engaging a recess in the housing to holdthe lock-case against the pressure of the sprin said locking bolt havinga slot to receive t e cam and engaged by the flange.

9. In 'a lock, a lock-case, a lockbarrel fitting therein and providedwith an integral projection on its end forming a cam, a locking bolthaving a slot receiving the cam, and a hard metal sheathing surroundingthe cam and part of its end.

In testimony whereof I aflix m signature.

EDWARD N. ACOBI.

